TP-Link modem fails ATM OAM F4 test in diagnostics.

Purchased a new DSL modem the TP-Link 8840T.Managed to get it to sync, after figuring out the VCI/VPI and establish a PPPOE connection, but in the ADSL diagnostics it is showing that it fails the ATM QAM F4 test :

Is this just not supported by Teksavvy, or did I do something wrong in the setup?--Rar.